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I have a Heil furnace......when the target temperature is hit the furnace blower continues to run and does not shut off. I can even set the target temperature below the actual temperature and it still runs.
What is going on with this thing?

Make sure that the fan switch at the tstat is in the auto position. Other then that, you may have a bad relay, circuit board, or comb. fan/limit control and will need to patronize your local heating contractor.

Now the freaks are on television, the freaks are in the movies. And its no longer the sideshow, its the whole show. The colorful circus and the clowns and the elephants, for all intents and purposes, are gone, and were dealing only with the freaks. - Jonathan Winters